Patristic Wisdom: Looking to the Seventh Sunday of Easter

From the Maesta by Duccio

Jesus spoke these words, lifted up His eyes to heaven, and said: “Father, the hour has come. Glorify Your Son, that Your Son also may glorify You, as You have given Him authority over all flesh, that He should give eternal life to as many as You have given Him. And this is eternal life, that they may know You, the only true God, and Jesus Christ whom You have sent. I have glorified You on the earth. I have finished the work which You have given Me to do. And now, O Father, glorify Me together with Yourself, with the glory which I had with You before the world was. (John 17:1–5)

Then one of those who are never weary of hearkening to the Scripture, and seriously pursue the study of Divine doctrines, will ask: Do we say that knowledge is eternal life; and that to know the one true and living God will suffice to give us complete security of expectation, and nothing else be lacking? Then how is faith apart from works dead? And when we speak of faith, we mean the true knowledge of God, and nothing else; for by faith comes knowledge: and the prophet Isaiah bears us witness, who said to some: If you do not believe this, neither will you understand it. And that the writings of the holy men are referring to the knowledge which consists in barren speculations, a thing wholly profitless, I think you will perceive from what follows. For one of the holy disciples said: You believe that there is one God. You do well. Even the demons believe—and tremble!. What then shall we say to this? How does Christ speak truth, when He says that eternal life is the knowledge of God the Father, the One true God, and (with Him) of the Son? I think, indeed, we must answer that the saying of the Savior is wholly true. For this knowledge is life, travailing as it were in birth of the whole meaning of the mystery, and vouchsafing unto us participation in the mystery of the Eucharist, whereby we are joined unto the living and life-giving Word. And for this reason, I think, Paul says that the Gentiles are made fellow-members of the body and fellow-partakers of Christ; inasmuch as they partake in His blessed Body and Blood; and our members may in this sense be conceived of, as being members of Christ. This knowledge, then, which also brings to us the Eucharist by the Spirit, is life. For it dwells in our hearts, shaping anew those who receive it into sonship with Him, and molding them into incorruption and piety towards God, through life according to the Gospel. Our Lord Jesus Christ, then, knowing that the knowledge of the One true God brings unto us, and, so to speak, promotes our union with, the blessings of which we have spoken, says that it is eternal life; insomuch as it is the mother and nurse of eternal life, being in its own power and nature pregnant with those things which cause life, and lead unto it.

Cyril of Alexandria, Commentary on the Gospel of John 11.5